Keeping up with 19200 baud
Chris Torek
chris at mimsy.umd.edu
Wed Nov 29 09:58:54 AEST 1989
In article <568 at panix.UUCP> alexis at panix.UUCP (Alexis Rosen) writes:
>This is not my field of expertise, but I believe that the Mac's built-in
>serial ports can't begin to cope with 19.2kbps because they get an interrupt
>for every byte.
It is possible to keep up with 1920 characters per second even with one
interrupt per character, *provided* that the interrupt handler is carefully
hand-coded, or the CPU is extremely fast. The average 68010 with the
average sloppy `do a few thousand instructions' style interrupt handler
will not keep up. A somewhat slow 68020 Unix box (the Sun 3/50) with
a reasonably good interrupt handler (i.e., not SunOS 4.x) will, although
it will use most of the CPU.
--
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain: chris at cs.umd.edu Path: uunet!mimsy!chris
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